21211221220012 has 12 divisors (see below), whose sum is σ = 37748783527560. Its totient is φ = 10425854497856.

The previous prime is 21211221219941. The next prime is 21211221220037. The reversal of 21211221220012 is 21002212211212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44939027773 + ... + 44939028244.

It is an arithmetic number, because the mean of its divisors is an integer number (3145731960630).

Almost surely, 2^{21211221220012} is an apocalyptic number.

It is an amenable number.

21211221220012 is a deficient number, since it is larger than the sum of its proper divisors (16537562307548).

21211221220012 is a wasteful number, since it uses less digits than its factorization.

21211221220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89878056080 (or 89878056078 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211221220012 its reverse (21002212211212), we get a palindrome (42213433431224).

The spelling of 21211221220012 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, twelve".